CN221002994U - Vertical axis wind turbine blade - Google Patents
Vertical axis wind turbine blade Download PDFInfo
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- CN221002994U CN221002994U CN202322960059.2U CN202322960059U CN221002994U CN 221002994 U CN221002994 U CN 221002994U CN 202322960059 U CN202322960059 U CN 202322960059U CN 221002994 U CN221002994 U CN 221002994U
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- axis wind
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- 238000005452 bending Methods 0.000 claims description 8
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- 239000000463 material Substances 0.000 claims description 6
- 238000004026 adhesive bonding Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 2
- 238000005755 formation reaction Methods 0.000 claims 2
- 239000003292 glue Substances 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract 1
- 239000011796 hollow space material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model relates to a wind power blade technology and discloses a vertical axis wind turbine blade which comprises a blade main body, an upper baffle plate and a lower baffle plate, wherein the blade main body comprises a back shell and a front shell, the circumference of the blade main body is not completely closed, an unclosed trailing edge opening is formed between the trailing edge position of the blade and the front shell, the upper baffle plate and the lower baffle plate seal the upper end and the lower end of the blade in the height direction, and the blade main body, the upper baffle plate and the lower baffle plate form a hollow blade with the trailing edge opening. The utility model overcomes the defects that the common blade cannot have large starting moment and high wind energy utilization rate and the blade is inconvenient to connect, integrates the structural characteristics of the lift type blade and the resistance type blade, well considers the starting moment and the wind energy utilization rate, achieves higher comprehensive performance and operation benefit, and has convenient connection and installation.
Description
Technical Field
The utility model relates to a vertical axis wind turbine blade which is mainly applied to the field of wind energy utilization.
Background
The vertical axis wind turbine can work in all wind directions, and the cross section shapes of the blades can be the same or similar, so that the design and the manufacture of the blades are much simpler than those of the horizontal axis wind turbine, the vertical axis wind turbine blades can be processed by economic methods such as extrusion molding, the cost of the blades is greatly reduced, and the competitiveness of wind power is further improved. However, the vertical axis wind turbine also has the problems of smaller starting moment and the like, the vertical axis wind turbine blades mainly comprise lift type blades and resistance type blades 2 types, the lift type blades have smaller starting moment compared with the resistance type blades, but the comprehensive utilization rate of wind energy is higher; the resistance type blade has large starting moment, but the wind energy utilization rate is lower when the resistance type blade rotates at a high speed, the common blade cannot have both the starting moment and the wind energy utilization rate, and the common vertical axis wind turbine blade and other components are inconvenient to connect.
Disclosure of Invention
Aiming at the problems existing in the prior art, the utility model provides a novel vertical axis wind turbine blade, which combines a lift type blade and a resistance type blade structure, so that the blade can exert the advantages of the resistance type blade at low wind speed and the self-starting capability is improved; when the blades rotate at a high speed, the lift type blades play a role of lifting, so that the starting moment and the wind energy utilization rate are well considered, and higher comprehensive performance and operation benefit are achieved; the strength and rigidity of the blade can be enhanced by additionally arranging a baffle plate; can set up blade connection structure, make things convenient for blade connection installation.
The invention is realized in the following way:
A vertical axis wind turbine blade comprising a blade body, an upper baffle, a lower baffle, the blade body comprising a rear housing and a front housing, the front housing facing inwardly, the front housing being closer to a rotational axis than the rear housing; the blade body is not completely closed in the circumferential direction, and an unclosed trailing edge opening is formed between the trailing edge of the blade and the front shell; the upper baffle plate and the lower baffle plate close the upper end and the lower end of the blade in the height direction, and the blade main body, the upper baffle plate and the lower baffle plate form a hollow blade with a rear edge opening.
Because the rear edge opening is arranged, under the same other conditions, the wind forces born by the blades with different incoming wind directions are obviously different, when the wind turbine blade is started, the rotation moment generated by the incoming wind from the rear edge to the front edge is larger than the rotation moment generated by the incoming wind from the front edge to the rear edge, the blade mainly plays the role of a resistance type blade, and the vertical axis wind turbine using the blade can generate larger starting moment than the common lift type vertical axis wind turbine.
When the wind turbine rotates at a high speed, the blade mainly plays a role of a lift type blade, the back surface of the blade is as same as a common lift type blade, the surface facing the outer side of the back shell is acted, the front surface of the blade mainly has 2 parts, one part is acted by the front shell, and the other part is acted by the surface facing the inner side (facing the rotating shaft) of the back shell of the area where the rear edge opening is positioned.
The larger the front shell ratio is, the closer to the common blade, and preferably, the front shell is 40% to 80% of the chord length of the blade in the chord length direction.
Furthermore, the hollow space of the blade corresponding to the front shell is filled with light materials, so that the strength and rigidity of the shell are enhanced.
Preferably, the vertical axis wind turbine blade further comprises an intermediate baffle plate, and the intermediate baffle plate is arranged between the upper baffle plate and the lower baffle plate, so as to improve the stress condition of the blade.
Preferably, the blade main body, the upper baffle, the lower baffle and the middle baffle are respectively processed and molded, and then the upper baffle, the lower baffle and the middle baffle are fixed on the blade main body.
Preferably, the blade body is formed by bending a plate material, and the edge of the front shell at the position of the rear edge opening is bent to enhance the rigidity and strength of the blade.
Preferably, the upper baffle, the lower baffle and the plurality of middle baffles are provided with protruding structures which extend out of the blade main body near the opening position of the rear edge, and blade mounting holes are processed near the protruding structures.
Preferably, the blade body is provided with webs in the height direction, the webs connecting the front shell and the rear shell to enhance the strength and rigidity of the blade.
Preferably, the front shell, the back shell and the web of the blade body are integrally formed.
Preferably, the web is fixed to the front and rear housings by welding or cementing or riveting.
Preferably, slots are formed in the front shell and the back shell, and the web is inserted into the slots after the blade main body is molded; preferably, the slot has a back-off structure to prevent the web from sliding out of the slot.
Preferably, the vertical axis wind turbine blade is formed in a segmented mode, and then a plurality of segmented blades are overlapped and spliced in the height direction and fixed together to form a complete blade.
Preferably, the blade main body and the upper baffle are integrally formed to form a blade segment unit, the upper end section of the blade main body in the blade segment unit is small, the lower end section of the blade main body in the blade segment unit is large, the upper end of the blade of one blade segment unit can be inserted into the lower end of the blade of the other blade segment unit, the two blade segment units are fixed by threaded connection (or cementing or riveting or welding), the total height of the blade can be realized by increasing the number of the blade segment units, and the lower end of the blade of the last blade segment unit is sealed by the lower baffle.
Preferably, the vertical axis wind turbine blade is used as a segmented unit blade, and then a plurality of segmented unit blades are overlapped and spliced in the height direction and fixed together to form a complete blade.
The utility model has the beneficial effects that:
According to the utility model, the trailing edge opening is arranged in the blade, so that the blade is combined with the structural characteristics of the lift type blade and the resistance type blade, the blade can play the advantages of the resistance type blade at low wind speed, the self-starting capability is improved, the strength and the rigidity of the blade are enhanced by additionally arranging the baffle plate and the web plate, the blade connection structure is arranged, the connection and the installation of the blade are facilitated, the low-speed running capability of the vertical axis wind turbine can be improved, the weight of the blade is reduced, the connection and the installation of the blade are facilitated, and the cost of the wind turbine is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious to those skilled in the art that other drawings may be obtained according to these drawings.
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic top view of the present invention;
FIG. 3 is a schematic view of a wind turbine of 2 blades according to the present invention;
FIG. 4 is a schematic view of a blade body of the present invention;
FIG. 5 is a schematic perspective view of a vane with intermediate baffle according to the present invention;
FIG. 6 is a schematic top view of a baffle plate with a projection arrangement of the present invention;
FIG. 7 is a schematic perspective view of a blade with a raised structural baffle according to the present invention;
FIG. 8 is a schematic cross-sectional view of a blade body provided with a web in accordance with the present invention;
FIG. 9 is an enlarged schematic cross-sectional view of a blade body with a slot according to the present invention;
FIG. 10 is a schematic perspective view of a vane segment unit of the present invention;
FIG. 11 is a schematic perspective view of a blade of the present invention after stacking 2 blade segment units;
FIG. 12 is a schematic view of the front shell edge bend of the present invention in the trailing edge opening position.
In the figure, 1-trailing edge, 2-back shell, 3-leading edge, 4-front shell, 5-upper baffle, 6-lower baffle, 7-trailing edge opening, 8-projection of blade rotation axis, 9-middle baffle, 10-web, 11-slot, 12-back buckle, 13-blade segment unit, 14-blade segment unit superposition connection screw, 15-blade mounting hole, 16-bending edge.
Detailed Description
The present invention will be further described with reference to the drawings and the detailed description, wherein the scope of the invention is not limited thereto, but equivalent changes and modifications are all within the scope of the invention.
The terms "left", "right", "inner", "outer", "upper", "lower", etc. are used herein for illustration only, and are not intended to be exclusive embodiments nor are they intended to limit the invention.
Example 1
The vertical axis wind turbine blade as shown in fig. 1, 2, 3 and 4 comprises a blade body, an upper baffle 5 and a lower baffle 6, wherein the blade body comprises a back shell 2 and a front shell 4; as shown in fig. 2 and 3, the front housing 4 faces inward, and the front housing 4 is closer to the blade rotation axis than the rear housing 2; as shown in fig. 1 and 4, the blade body is not fully closed circumferentially, and an unclosed trailing edge opening 7 is formed between the blade trailing edge and the front shell 4; as shown in fig. 1, the upper baffle 5 and the lower baffle 6 close the upper and lower ends of the blade in the height direction, and the blade body, the upper baffle 5, and the lower baffle 6 form a hollow blade with a trailing edge opening 7.
Due to the arrangement of the trailing edge opening 7, under the same other conditions, the wind forces born by the blades with different incoming wind directions are obviously different, as shown in fig. 3 and 4, when the wind turbine blade is started, the rotation moment generated by the incoming wind from the trailing edge 1 to the leading edge 3 is larger than the rotation moment generated by the incoming wind from the leading edge 3 to the trailing edge 1, the blades mainly play the role of resistance type blades, and as shown in fig. 3, when the incoming wind is from left to right, the rotation moment generated by the upper blade is larger than the rotation moment generated by the lower blade, and the wind turbine driven by the two blades rotates clockwise; if the wind is from right to left, the rotation moment generated by the lower blade is larger than that of the upper blade, and the wind turbine driven by the two blades rotates clockwise, so that the vertical-axis wind turbine using the blade can generate larger starting moment than the common lift-type vertical-axis wind turbine.
When the wind turbine rotates at a high speed, the blade mainly plays a role of a lift type blade, and as shown in fig. 1 and 4, the back surface of the blade acts like a common lift type blade from the surface of the back shell 2 facing to the outer side; the front of the blade has mainly 2 parts, one part being acted on by the surface of the front shell 4 facing the inside and the other part being acted on by the surface of the back shell 2 facing the inside (towards the rotation axis) in the area of the trailing edge opening 7.
The larger the front shell 4 is, the closer to the normal blade, and preferably, the front shell 4 has a length in the chord length direction of 40% to 80% of the chord length of the blade.
Further, light materials can be filled in the hollow space of the blade corresponding to the front shell 4, so that the strength and rigidity of the shell are enhanced.
Further, the vertical axis wind turbine blade further comprises an intermediate baffle 9, said intermediate baffle 9 being arranged between the upper baffle 5 and the lower baffle 6. When the distance between the upper baffle 5 and the lower baffle 6 is too large, the strength and the rigidity of the blade are weakened, and the middle baffle 9 is additionally arranged between the upper baffle 5 and the lower baffle 6 by combining factors such as the thickness of the shell of the blade, as shown in fig. 5, so that the stress condition of the blade is improved, and the number of the middle baffles 9 is determined according to the height of the blade and the stress condition of the blade.
Preferably, the blade body, the upper baffle 5, the lower baffle 6 and the middle baffle 9 are respectively processed and molded, and then the upper baffle 5, the lower baffle 6 and the middle baffle 9 are installed and fixed on the blade body.
Preferably, the blade body is formed by bending a plate material, and the edge of the front shell at the position of the rear edge opening is subjected to bending treatment so as to enhance the rigidity and the strength of the blade. The bending edge 16 in fig. 12 is a schematic bending length and shape, and the bending length and shape are selected according to the thickness, material, etc. of the plate in the engineering.
Preferably, the upper baffle 5, the lower baffle 6 and the plurality of intermediate baffles 9 have a protruding structure protruding from the blade body near the position of the opening at the rear edge, as shown in fig. 6, and a blade mounting hole 15 is formed near the protruding structure, and the blade is shown in fig. 7 in a schematic perspective view. When the blade is mounted, the blade is fixed to the frame of the wind turbine by screw connection at the position of the blade mounting hole 15.
Example two
The difference from the first embodiment is that the blade body is provided with a web 10 in the height direction, and the web 10 connects the front shell 4 and the rear shell 2 as shown in fig. 8, so as to enhance the strength and rigidity of the blade.
Preferably, the front shell 4, the back shell 2 and the web 10 of the blade body are integrally formed.
Preferably, the web 10 is fixed to the front housing 4 and the rear housing 2 by welding or cementing or riveting.
Preferably, the web 10 is mounted to the front and rear cases 4 and 2 by a slot structure, as shown in fig. 9, the front and rear cases 4 and 2 are processed with slots 11, and the web 10 is inserted into the slots 11 after the front and rear cases 4 and 2 are molded. Preferably, the slot 11 has a back-off structure 12 to prevent the web 10 from sliding out of the slot 11.
The web 10 is fixed to the blade body by welding or gluing or slot structures, and besides the installation mode has the characteristics, one consideration is that the web 10 can be fixed in sections, so that interference with the intermediate baffle 9 is avoided.
Example III
The difference between the first embodiment and the second embodiment is that the blade is formed by sections, and then the sections are overlapped and spliced in the height direction and fixed together to form the complete blade.
Preferably, as shown in fig. 10, the blade body and the upper baffle are integrally formed to form the blade segment unit 13, the blade body in the blade segment unit 13 has a small upper end and a large lower end in cross section, as shown in fig. 11, the upper end of the blade of one blade segment unit 13 can be inserted into the lower end of the blade of the other blade segment unit 13, the two blade segment units are fixed by screw thread connection (or cementing or riveting or welding), the total height of the blade can be realized by increasing the number of segment units, and the lower end of the blade of the last blade segment unit 13 is closed by the lower baffle 6.
Preferably, the vertical axis wind turbine blade is used as a segmented unit blade, and then a plurality of segmented unit blades are overlapped and spliced in the height direction and fixed together to form a complete blade.
Claims (10)
1. A vertical axis wind turbine blade, comprising a blade body, an upper baffle and a lower baffle, wherein the blade body comprises a back shell and a front shell, the front shell faces to the inner side, and the front shell is closer to the rotation axis of the blade than the back shell; the blade body is not completely closed in the circumferential direction, and an unclosed trailing edge opening is formed between the trailing edge of the blade and the front shell; the upper baffle plate and the lower baffle plate close the upper end and the lower end of the blade in the height direction, and the blade main body, the upper baffle plate and the lower baffle plate form a hollow blade with a rear edge opening.
2. A vertical axis wind turbine blade as defined in claim 1, further comprising an intermediate baffle disposed between the upper and lower baffles.
3. A vertical axis wind turbine blade as claimed in claim 1 or claim 2 wherein the upper, lower and intermediate baffles have projecting formations extending from the blade body adjacent the trailing edge opening and blade mounting apertures are machined adjacent the projecting formations.
4. A vertical axis wind turbine blade as claimed in claim 1 or claim 2 wherein the blade body is formed from a sheet of material by bending and the edges of the front shell at the location of the trailing edge opening are bent.
5. A vertical axis wind turbine blade as claimed in claim 1 or claim 2 wherein the blade body is provided with webs in the height direction which connect the front and rear shells.
6. A vertical axis wind turbine blade as claimed in claim 5 wherein the web is secured to the front and rear shells by welding or gluing or riveting.
7. A vertical axis wind turbine blade as claimed in claim 5 wherein the front and rear shells are formed with slots into which the web is reinserted after the blade body has been formed; the slot is provided with a back-off structure, so that the web plate is prevented from sliding out of the slot.
8. A vertical axis wind turbine blade as claimed in claim 1 or claim 2 wherein the blade body, upper baffle, lower baffle, intermediate baffle are each formed separately and then secured to the blade body.
9. A vertical axis wind turbine blade as claimed in claim 1, wherein the blade body and the upper baffle are integrally formed to form a blade segment unit, wherein the blade body in the blade segment unit has a small cross section at the upper end and a large cross section at the lower end, the upper end of the blade of one blade segment unit can be inserted into the lower end of the blade of the other blade segment unit, the two blade segment units are fixed by threaded connection, glue connection, riveting or welding, the total height of the blade can be realized by increasing the number of the blade segment units, and the lower end of the blade of the last blade segment unit is closed by the lower baffle.
10. A vertical axis wind turbine blade as claimed in claim 1 or claim 2 wherein the vertical axis wind turbine blade is first formed as segmented unit blades and then a plurality of segmented unit blades are stacked and spliced in the height direction to form a complete blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322960059.2U CN221002994U (en) | 2023-11-02 | 2023-11-02 | Vertical axis wind turbine blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322960059.2U CN221002994U (en) | 2023-11-02 | 2023-11-02 | Vertical axis wind turbine blade |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221002994U true CN221002994U (en) | 2024-05-24 |
Family
ID=91092576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322960059.2U Active CN221002994U (en) | 2023-11-02 | 2023-11-02 | Vertical axis wind turbine blade |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221002994U (en) |
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2023
- 2023-11-02 CN CN202322960059.2U patent/CN221002994U/en active Active
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